Split libsquashfs.a into low seperate libraries

The idea is to make libsquashfs.a independend of libfstree.a, so it becomes
a general purpose squashfs manipulation library. All the high level glue code
for libfstree.a and utilites that are overly specific with to tools are moved
to a seperate librarby.

This commit makes the first step by moving the stuff with dependencies on
libfstree to a seperate library.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 47 insertions, 0 deletions

diff --git a/lib/sqfshelper/write_export_table.c b/lib/sqfshelper/write_export_table.c
new file mode 100644
index 0000000..e42df15
--- /dev/null
+++ b/lib/sqfshelper/write_export_table.c
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * write_export_table.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "highlevel.h"
+#include "util.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+int write_export_table(int outfd, fstree_t *fs, sqfs_super_t *super,
+		       compressor_t *cmp)
+{
+	uint64_t *table, start;
+	size_t i, size;
+	int ret;
+
+	if (fs->inode_tbl_size < 1)
+		return 0;
+
+	table = alloc_array(sizeof(uint64_t), (fs->inode_tbl_size - 1));
+
+	if (table == NULL) {
+		perror("Allocating NFS export table");
+		return -1;
+	}
+
+	for (i = 1; i < fs->inode_tbl_size; ++i) {
+		if (fs->inode_table[i] == NULL) {
+			table[i - 1] = htole64(0xFFFFFFFFFFFFFFFF);
+		} else {
+			table[i - 1] = htole64(fs->inode_table[i]->inode_ref);
+		}
+	}
+
+	size = sizeof(uint64_t) * (fs->inode_tbl_size - 1);
+	ret = sqfs_write_table(outfd, super, cmp, table, size, &start);
+
+	super->export_table_start = start;
+	super->flags |= SQFS_FLAG_EXPORTABLE;
+	free(table);
+	return ret;
+}